// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:
//      Refresh, visplane stuff (floor, ceilings).
//
//-----------------------------------------------------------------------------

#ifndef __R_PLANE__
#define __R_PLANE__

#include "r_data.h"

// Visplane related.
extern  short*          lastopening;

typedef void (*planefunction_t) (int top, int bottom);

extern planefunction_t  floorfunc;
extern planefunction_t  ceilingfunc_t;

extern short            floorclip[SCREENWIDTH];
extern short            ceilingclip[SCREENWIDTH];

extern fixed_t          yslope[SCREENHEIGHT];
extern fixed_t          distscale[SCREENWIDTH];

void R_InitPlanes (void);
void R_ClearPlanes (void);

void
R_MapPlane
( int           y,
  int           x1,
  int           x2 );

void
R_MakeSpans
( int           x,
  int           t1,
  int           b1,
  int           t2,
  int           b2 );

void R_DrawPlanes (void);

visplane_t*
R_FindPlane
( fixed_t       height,
  int           picnum,
  int           lightlevel );

visplane_t*
R_CheckPlane
( visplane_t*   pl,
  int           start,
  int           stop );

#endif  // __R_PLANE__
